xnu-1228.3.13.tar.gz

[apple/xnu.git] / osfmk / ppc / commpage / commpage_asm.s

diff --git a/osfmk/ppc/commpage/commpage_asm.s b/osfmk/ppc/commpage/commpage_asm.s
index 266d437ec1f58c1a151a4b965ec661f4dd61d7e3..d3ea83c249c9614beef5b5a2afe32cdd42dbc570 100644 (file)
--- a/osfmk/ppc/commpage/commpage_asm.s
+++ b/osfmk/ppc/commpage/commpage_asm.s
@@ -1,23 +1,29 @@
 /*
 /*

- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 

- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.

  * 
  * 

- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER

  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.

  * 
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 
 #include <sys/appleapiopts.h>
  */
 
 #include <sys/appleapiopts.h>


@@ -73,8 +79,8 @@ Ldata:
  *     * C O M M P A G E _ S E T _ T I M E S T A M P *
  *     ***********************************************
  *
  *     * C O M M P A G E _ S E T _ T I M E S T A M P *
  *     ***********************************************
  *

- *     Update the gettimeofday() shared data on the commpage, as follows:
- *             _COMM_PAGE_TIMESTAMP = a BSD-style pair of uint_32's for secs and usecs
+ *     Update the gettimeofday() shared data on the commpages, as follows:
+ *             _COMM_PAGE_TIMESTAMP = the clock offset at timebase (seconds)

  *             _COMM_PAGE_TIMEBASE = the timebase at which the timestamp was valid
  *             _COMM_PAGE_SEC_PER_TICK = multiply timebase ticks by this to get seconds (double)
  *     The convention is that if the timebase is 0, the data is invalid.  Because other
  *             _COMM_PAGE_TIMEBASE = the timebase at which the timestamp was valid
  *             _COMM_PAGE_SEC_PER_TICK = multiply timebase ticks by this to get seconds (double)
  *     The convention is that if the timebase is 0, the data is invalid.  Because other


@@ -94,18 +100,19 @@ Ldata:
  *     When called:
  *             r3 = upper half of timebase (timebase is disabled if 0)
  *             r4 = lower half of timebase
  *     When called:
  *             r3 = upper half of timebase (timebase is disabled if 0)
  *             r4 = lower half of timebase

- *             r5 = seconds part of timestamp
- *             r6 = useconds part of timestamp
+ *             r5 = upper half of timestamp
+ *             r6 = lower half of timestamp

  *             r7 = divisor (ie, timebase ticks per sec)
  *     We set up:
  *             r8 = ptr to our static data (kkBinary0, kkDouble1, kkTicksPerSec)
  *             r7 = divisor (ie, timebase ticks per sec)
  *     We set up:
  *             r8 = ptr to our static data (kkBinary0, kkDouble1, kkTicksPerSec)

- *             r9 = ptr to comm page in kernel map
+ *             r9 = ptr to 32-bit commpage in kernel map
+ *     r10 = ptr to 64-bit commpage in kernel map

  *
  *     --> Interrupts must be disabled and rtclock locked when called.  <--
  */
  
         .align 5
  *
  *     --> Interrupts must be disabled and rtclock locked when called.  <--
  */
  
         .align 5

-LEXT(commpage_set_timestamp)                           // void commpage_set_timestamp(tbr,secs,usecs,divisor)
+LEXT(commpage_set_timestamp)                           // void commpage_set_timestamp(tbr,secs,divisor)

         mfmsr  r11                                                     // get MSR
         ori            r2,r11,MASK(MSR_FP)                     // turn FP on
         mtmsr  r2
         mfmsr  r11                                                     // get MSR
         ori            r2,r11,MASK(MSR_FP)                     // turn FP on
         mtmsr  r2


@@ -113,16 +120,24 @@ LEXT(commpage_set_timestamp)                              // void commpage_set_timestamp(tbr,secs,usecs,di
         
         or.            r0,r3,r4                                        // is timebase 0? (thus disabled)
         lis            r8,hi16(Ldata)                          // point to our data
         
         or.            r0,r3,r4                                        // is timebase 0? (thus disabled)
         lis            r8,hi16(Ldata)                          // point to our data

-        lis            r9,ha16(EXT(commPagePtr))       // get ptr to address of commpage in kernel map
+        lis            r9,ha16(EXT(commPagePtr32))     // get ptrs to address of commpages in kernel map
+               lis             r10,ha16(EXT(commPagePtr64))

         stfd   f1,rzSaveF1(r1)                         // save a FPR in the red zone
         ori            r8,r8,lo16(Ldata)
         stfd   f1,rzSaveF1(r1)                         // save a FPR in the red zone
         ori            r8,r8,lo16(Ldata)

-        lwz            r9,lo16(EXT(commPagePtr))(r9)   // r9 <- commPagePtr
+        lwz            r9,lo16(EXT(commPagePtr32))(r9) // r9 <- 32-bit commpage ptr
+               lwz             r10,lo16(EXT(commPagePtr64))(r10) // r10 <- 64-bit commpage ptr

         lfd            f1,kkBinary0(r8)                        // get fixed 0s
         li             r0,_COMM_PAGE_BASE_ADDRESS      // get va in user space of commpage
         lfd            f1,kkBinary0(r8)                        // get fixed 0s
         li             r0,_COMM_PAGE_BASE_ADDRESS      // get va in user space of commpage

-        cmpwi  cr1,r9,0                                        // is commpage allocated yet?
-        sub            r9,r9,r0                                        // r9 <- commpage address, biased by user va
-        beq--  cr1,3f                                          // skip if not allocated
-        stfd   f1,_COMM_PAGE_TIMEBASE(r9)      // turn off the timestamp (atomically)
+        cmpwi  cr1,r9,0                                        // is 32-bit commpage allocated yet?
+               cmpwi   cr6,r10,0                                       // is 64-bit commpage allocated yet?
+        sub            r9,r9,r0                                        // r9 <- 32-bit commpage address, biased by user va
+               sub             r10,r10,r0                                      // r10<- 64-bit commpage address
+        beq--  cr1,3f                                          // skip if 32-bit commpage not allocated (64-bit won't be either)
+               bne++   cr6,1f                                          // skip if 64-bit commpage is allocated
+               mr              r10,r9                                          // if no 64-bit commpage, point to 32-bit version with r10 too
+1:
+        stfd   f1,_COMM_PAGE_TIMEBASE(r9)      // turn off the 32-bit-commpage timestamp (atomically)
+               stfd    f1,_COMM_PAGE_TIMEBASE(r10) // and the 64-bit one too

         eieio                                                          // make sure all CPUs see it is off
         beq            3f                                                      // all we had to do is turn off timestamp
         
         eieio                                                          // make sure all CPUs see it is off
         beq            3f                                                      // all we had to do is turn off timestamp
         


@@ -130,8 +145,10 @@ LEXT(commpage_set_timestamp)                               // void commpage_set_timestamp(tbr,secs,usecs,di
         stw            r3,rzNewTimeBase(r1)            // store new timebase so we can lfd
         stw            r4,rzNewTimeBase+4(r1)
         cmpw   r0,r7                                           // do we need to recompute _COMM_PAGE_SEC_PER_TICK?
         stw            r3,rzNewTimeBase(r1)            // store new timebase so we can lfd
         stw            r4,rzNewTimeBase+4(r1)
         cmpw   r0,r7                                           // do we need to recompute _COMM_PAGE_SEC_PER_TICK?

-        stw            r5,_COMM_PAGE_TIMESTAMP(r9)     // store the new timestamp
+        stw            r5,_COMM_PAGE_TIMESTAMP(r9)     // store the new timestamp in the 32-bit page

         stw            r6,_COMM_PAGE_TIMESTAMP+4(r9)
         stw            r6,_COMM_PAGE_TIMESTAMP+4(r9)

+        stw            r5,_COMM_PAGE_TIMESTAMP(r10)// and the 64-bit commpage
+        stw            r6,_COMM_PAGE_TIMESTAMP+4(r10)

         lfd            f1,rzNewTimeBase(r1)            // get timebase in a FPR so we can store atomically
         beq++  2f                                                      // same ticks_per_sec, no need to recompute
         
         lfd            f1,rzNewTimeBase(r1)            // get timebase in a FPR so we can store atomically
         beq++  2f                                                      // same ticks_per_sec, no need to recompute
         


@@ -144,10 +161,11 @@ LEXT(commpage_set_timestamp)                              // void commpage_set_timestamp(tbr,secs,usecs,di
         lfd            f3,kkTicksPerSec(r8)            // float new ticks_per_sec + 2**52
         lfd            f4,kkDouble1(r8)                        // f4 <- double(1.0)
         mffs   f5                                                      // save caller's FPSCR
         lfd            f3,kkTicksPerSec(r8)            // float new ticks_per_sec + 2**52
         lfd            f4,kkDouble1(r8)                        // f4 <- double(1.0)
         mffs   f5                                                      // save caller's FPSCR

-        mtfsfi 7,0                                                     // clear Inexeact Exception bit, set round-to-nearest
+        mtfsfi 7,1                                                     // clear Inexeact Exception bit, set round-to-zero

         fsub   f3,f3,f2                                        // get ticks_per_sec
         fdiv   f3,f4,f3                                        // divide 1 by ticks_per_sec to get SEC_PER_TICK
         stfd   f3,_COMM_PAGE_SEC_PER_TICK(r9)
         fsub   f3,f3,f2                                        // get ticks_per_sec
         fdiv   f3,f4,f3                                        // divide 1 by ticks_per_sec to get SEC_PER_TICK
         stfd   f3,_COMM_PAGE_SEC_PER_TICK(r9)

+        stfd   f3,_COMM_PAGE_SEC_PER_TICK(r10)

         mtfsf  0xFF,f5                                         // restore FPSCR
         lfd            f2,rzSaveF2(r1)                         // restore FPRs
         lfd            f3,rzSaveF3(r1)
         mtfsf  0xFF,f5                                         // restore FPSCR
         lfd            f2,rzSaveF2(r1)                         // restore FPRs
         lfd            f3,rzSaveF3(r1)


@@ -156,6 +174,7 @@ LEXT(commpage_set_timestamp)                                // void commpage_set_timestamp(tbr,secs,usecs,di
 2:                                                                                     // f1 == new timestamp
         eieio                                                          // wait until the stores take
         stfd   f1,_COMM_PAGE_TIMEBASE(r9)      // then turn the timestamp back on (atomically)
 2:                                                                                     // f1 == new timestamp
         eieio                                                          // wait until the stores take
         stfd   f1,_COMM_PAGE_TIMEBASE(r9)      // then turn the timestamp back on (atomically)

+        stfd   f1,_COMM_PAGE_TIMEBASE(r10)     // both

 3:                                                                                     // here once all fields updated
         lfd            f1,rzSaveF1(r1)                         // restore last FPR
         mtmsr  r11                                                     // turn FP back off
 3:                                                                                     // here once all fields updated
         lfd            f1,rzSaveF1(r1)                         // restore last FPR
         mtmsr  r11                                                     // turn FP back off